The March listing marks 13 consecutive months of New York City posting the largest volume of tech jobs. Still, other cities are growing their listings at a faster clip.

Buoyed by startups and an increased focus on technology at media and communications companies, New York City was the No. 1 city for tech job postings in March, marking 13 months in a row in the frontrunner spot, according to Dice.com. The career website released a report on the fastest-growing cities for technology jobs on March 12.

However, Gotham did not make it onto Dice's Top 10 list for fastest growth. The New York/New Jersey area had 9,195 listings, up 6 percent from a year ago—a significantly slower rate of growth from last March, when job postings surged 24 percent.

Raleigh, N.C., came in first in the survey for growth, with a 50 percent spike in posting and a total of 1,100 listings. It was followed by Richmond, Va., Houston and Sacramento.

"Over the last six months we've seen [growth for New York] moderate, but single-digit growth is still substantial, since it's off of a very big number," said Scot Melland, CEO of Dice Holdings Inc., parent company of Dice.com. He blamed the city's slowdown on a pullback in hiring in the financial services sector.

Melland noted that most of the tech job postings came from a broad range of industries, but the cut in financial services jobs was still enough to hold down growth.

Social media companies and assorted tech startups have become an important source of job growth. Facebook is opening a New York office this year, and relatively new tech companies like Foursquare and Tumblr are expanding at a rapid clip.

"This is a great place for people with technical skills to launch companies," said Clifford Schorer, an adjunct professor with the Eugene Lang Entrepreneurship Center at Columbia Business School.

Among the metro areas, Washington, D.C./Baltimore followed New York, with 8,289 tech job postings for March, a 2 percent gain over a year ago, according to Dice. Silicon Valley was third, with 5,710 listings, an increase of 13 percent.

Melland added that the technology industry was essentially at full employment, with an unemployment rate of 4 percent, and that clients everywhere struggled to find people with the right skills.

"It's a tight labor market," he said. "And when you get into the major tech centers like New York, Silicon Valley, Boston, it's an even tighter labor market."